Reloadable cartridge-fuse.



H. H. OSWALD.

BELOADABLE CARTRIDGE FUSE.

APPLICATION FILED JUNE 18, 1912.

1,1 33,175 Patented Mar. 23, 191 5.

' 30 the fusible strip To all echo Ia it may concern:

A a citizen ,ofthe United States,

Fort Ann,

State,o New York, have invented a certain new and useful Improvement in in Q A rounding 'th I Hanna)! 1:. oswann, or roar STATES. PATENT ANN, 203x.

YRELOADABLE caamrnea-rusa HERMAn H.-QswAnD,

Be it known that I,

in the countyof as Cartrid e-Fuses, of which the a spec' cation, reference being to the accompanying drawing.

Myinvention relates to iuclo'sed tubular and hasjfor itsprmcipal objects to do away with the waste of the. outer casing after a fuse has provide means by which the .cartrldge or casing can be easily reloaded without the use'of tools.

Briefly stat following 1s or cartridge fuses,

d, I attain my fusible strip or link with refractory or granular material inclosed in a paper envel op so as to form acomplete an self-contained'unit. independent oftheouter casing.

- panying drawings tridge rings B to receive from the .tu

rings B maybe and reduction end cap A is shown' infl g.

- The charge or reload My invention is illustrated in the. accomin which:

' Figure 1 is a longitudinal section of a carfuse' embodying my invention. Fig. 2 is a longitudinal section of the tubular casing of the one'of the-end disks,"and Fig. 4 is a side view of th reload or charge, including shown in dotted lines.

Referring to the drawings, A is a-tubular shelhor casing carrying threaded brass end the end secure. inplace the slotted end caps A. The

secured screws 12 or in any manner, and it is to be noted that the ca s A areprovided withvents a which e B. The inner.

within the edges of the rings frangible envelop breaks at thereby permitting the escape of the gases of the internal pressure. One

vents a" and a diametral' slot J. slots are to pass the.

at both ends,

the opposite ends of the-casing, as shown n 2, and indicated .in dotted lines 1n Fig. 3.

in. Fig. 1. It comprises an envelop F preferably of asbestos paper, 1n cylindrical form,

, w "ch extend Reloadable had therein of the end caps and nals, being spaced blown, and' to object by suI- d L. It will be noted motion thus taken up,

fuse. Fig. 3 is a face view of the pins j and 9 1m rings B1 which upon the tube by; For example,.whilethe casing A otherdesired and suitable these vents,

3, having six These 1 flat copper terminals the cooperating slots isshown removed e in Fig. 4, and inserted thereinl sp c fi of wars aa. Patented Ma. 23, 1915. Application filed 1a. 18,1912. Serial no. 704,322.

with closed ends, which is packed with filling'. materialv L, a gr Y Y. axially through t mder and are secured to copper terminals 7'. Inside of the end caps and the ends of the paper envelop. transverse pins i pass through the copper terminals, and outside the ends of the envelop parallel pins 7'. are also secured in the termiaway from the'envel'op y when the cartridge is Fig. 1, and the end caps and rings are in position,'-the. pin 7' will rest against the end walls of the envelop and press them loaded as shown in ular refractory mate- I rial, surrounding the fuse strips or l 'e paper cyljust the thickness of the disks A, so that against the end caps, while the pins j will lie outside the caps, and prevent any end motion of the fuse in the granular material that not only is en can not twist .or turn. All stresses which placed in 'or removed from a circuit are taken up by the end caps, being communicated thbreto directly in part and through part. c

i I am aware that many. changes and modifications'may be made in the device which I have thus described, without departing. from the spirit of my invention; and I wish it distinctly understood that I contemplate all such changes or modifications as fall within the scope of the appended claims. is shown cylindrical and is preferably of fiber, it

(1' but the flat terminals are rigidly secured to the tubeA so they may be made in other'shapes or of other I 7 material; while the end caps are-secure by rings B and B, other means may be employed;- while asbestos paper is mentioned forthe envelop F, and end strains aretaken up by pins 9" and 3' theseparts may be replaced by otheigs o dififerentmaterials or diflerent forms. So

'nd-B may be madeiof any desired mate- 5411, the pins j ;may side of'the envelop F, and th projections a Y may be laced on the end caps A and the on .the tube body A. The characterist1c""-nd essential feature of the invention is to have a reload or self-conalso'the end rings B be plac' inside 01f outmg, so that the latter can be used more than tained unit charge independent of the cas- Having thus described my invention, what I claim and desire to secure by Letters Patcut is l. A reloadable cartridge fuse comprising a tubular casing vented end caps for the tube, an inner paper envelop F, a fuse link J with terminals j projecting from its opposite ends, and pins or studs j-j in the terminals j, lying without and within the end caps respectively and adapted to engage the outer and the inner faces of the end caps when the 'fuse is loaded.

2. In an electric fuse, an outer cartridge container of infrangible material, together with an inner envelop of frangible material snugly fitting within said outer container and inclosing a fuse link having-projecting and exposed terminals, said container having apertures in its walls extending to the walls of the inner envelop whereby the inner envelop is without external-support in the region of each aperture and points of fracture thereof are defined at the apertures.

3. In an electric fuse, an outer cartridge container of infrangible material, together with an inner envelop of frangible material snugly fitting within said outer container and inclosing a fuse link having projecting and exposed terminals, ing apertures in its end walls extending to the end walls of the inner envelop, whereby the areas thereof opposite the apertures are without external support and points of fracture thereof are thus, defined. =i

, 4. An electric fuse comprising a cylindrical tube of insulating material, concentric conducting sleeves permanently secured to the ends thereof" and transversely flush with containing refractory said container havi the same, flat end caps bearing against said sleeves, and a flanged ring threaded onto each sleeve and clamping said flat caps be tween their flanges and metallic sleeves,

5. A reloadable electric fuse comprising an outer cartridge container of infrangible material, removable end caps for the same, a fuse extending between the end caps and surrounded by an inner frangible envelop material, and abutments retaining the fuse and its envelop in fixed longitudinal position with respect to the end caps and located one interiorly of the frangible envelop and bearing against the end cap and another exteriorly of the end cap.

6. A cartridge for a reloadable electric fuse comprising a substantially cylindrical frangible envelop containingrrefractory material, the link extending axially through said envelop and having its end terminals projecting from the ends thereof, and abutments on the end terminals of the fuse engaging the interior walls of the envelop whereby the fuse link is retained in longitudinal position within the envelop and in turn braces the envelop against collapse.

In testimony whereof I afiix my signature in presence of two witnesses.

HERB/IAN H. OSWALD. Witnesses R. T. SHEETS, GEORGE ALBERT DOOIN.

the ends of said together with a removable v fuse link within said cartridge having end 

